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Re: st: NBREG for ordinal scales
At 10:00 PM 10/9/2006, Matthew C. Johnson wrote:
The measure is a composite scale. One is a four-item property offending
scale: "How often in the past 12 months did you ..." Response options:
0-never; 1-once or twice; 2-three or four times; 3-five or more times. The
other scale is a five-item violent offending scale with the same format. I
have been wary to use a count regression procedure because there is
nothing in the statistics literature that mentions, one way or the other,
using negative binomial regression for this type of data. However, there
are several prominent articles (within the criminological literature) that
do this. As a mere grad student, I am a bit confused.
So, you add these items up, and the property offending scale goes
from 0-12 and the violent offending scale goes from 0-15? Given the
coding of these items, it seems shaky to use count models. If I was
bound and determined to use count models, I think I would at least
recode the items first, so they were coded 0, 1.5, 3.5, and 5, or
something like that, so they would at least be my best guess as to
what the count actually was. The articles just do this stuff, with
no justification offered whatsoever, no seminal source cited??? As a
mere Sociology statistics professor, I am a bit confused. :)
-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
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